Tactician mode is fine, even too easy sometimes...most of the times... After completing act 1 twice, I've went honor mode and nearly finish up to act2 without dying once with any character and I was going blind on act2 not know what lied ahead...was cool... just the retarded fire boss which is way too imbalanced and I've complained a lot here in the forum... stopped playing too because that broke my fun..I could of continue my campaign anyway...but preferred not to.
There is a way to do this though... got to read the text and follow the quest in some sort of order. When you see the enemies higher lvl than yours, maybe you're too far ahead. People made a map on google, act 2 sectors by what level you should be.... as it act as an "opened world".
So doing it in the proper order is easy for the most part as oppose to doing it the wrong way which could be almost impossible.
At the time I didn't had the map
https://divinityoriginalsin2.vidyawiki.com/Areas+By+LevelSo I remember when I first saw the camp where Saheila was kept hostage...I've just decided not to go there when I saw they were 2 lvl higher... and went somewhere else...